Tree guard



FIG. 1 is a top plan view of a tree guard according to my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof; and,

FIG. 6 is an upper right perspective view thereof.

The broken lines shown in the drawings illustrate portions of the tree guard that do not form a part of the claimed design. 

CLAIM The ornamental design for a tree guard, as shown and described. 